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matronics(at)cencula.com
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 Posted: Wed Mar 28, 2007 11:12 pm Post subject: Purge valve return line |
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Listers,
Hopefully you guys with an AFP system can help out. 
I'm planning on installing an IO-360 in my -7A (eventually...sigh) and may
consider using one of the AFP systems. I've heard it's beneficial to install
return lines to the tanks (getting ready to rivet them up), but I've got a
few questions:
1. How is an AFP system with return lines connected up?
2. Does it matter where the return line should be located as it runs back into
the tank (top / bottom)?
3. Is there anything else I need to be aware of during the build phase in
order to ease installation of an AFP system?
Thanks,
Mike Cencula
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rv9jim(at)juno.com
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| Posted: Thu Mar 29, 2007 4:57 am Post subject: Purge valve return line |
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Mike,
I have the purge system in my IO-360. I ran my return line back
to the feed line on the right tank before the selector valve. This way
any returning fuel will go to the right tank. However, if I knew what I
know now, I would have run the return line to the tank. Reason? any
vapor / bubbles would go into the tank and be vented. Recirculating the
hot fuel back into the line prior to the valve lets it cool before I use
it. Thus, I think it will be fine. Just a matter of degrees.
I ran my return line back along side the feed lines. This way I
could secure them together. Run the feed lines with smooth bends. I had
to shorten the line from the fire wall to the engine pump. I also put a
45 deg. fitting on the inlet to the pump. This way the feed line makes a
"single plane" (geometric) turn. Other wise the hose must turn upward
and then 90 deg to the center of the fuselage to get to the fuel pump. A
45 deg fitting at the inlet will not impede the fuel on the suction side.
Putting a 90 deg on the outlet is no problem as it is under pressure.
My outlet line (that goes down to the air meter) was fitted with a 45
deg. fitting that attached to the "T" fitting on the outlet of the engine
pump. the lower end of the line had a 90 deg. fitting where it attaches
to the air meter. The 45 deg. up at the fuel pump allowed the line to
avoid the tri gear bracing. You can check these out at my web site
www.websites.expercraft.com/jimn
Jim Nelson
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dan(at)rvproject.com
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matronics(at)cencula.com
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| Posted: Thu Mar 29, 2007 7:43 pm Post subject: Purge valve return line |
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Thanks, Dan. I had actually already read you site (great site) prior to
making my posting. Your statement of:
"Had I known I would be installing the system from the get-go I would have
installed return lines all the way into the tanks."
from http://www.rvproject.com/20030519.html is what got me thinking about
this. I looked at the scanned AFP manual on your site, but neither of the
two system drawings show dedicated return lines going back to the tanks
(unless I'm misreading them). Hence, question #1. The drawing on page 7 of
that .pdf seems to be your setup.
I could just pop an extra fitting in the cover plate of the tank, but should
it be at the bottom, or near the top? If I end up not using it, I suppose I
could just cap it off.
Mike
On Thursday March 29 2007 09:15 am, Dan Checkoway wrote:
[quote]
http://www.rvproject.com/20030516.html
http://www.rvproject.com/20030519.html
Some photos from those and other pages on my site (www.rvproject.com).
Ignore the arrows, they're probably other stuff, but the photos show where
I put the purge return fitting on the firewall and how I plumbed it.
http://rvimg.com/images/2003/20030516_afp_purge_tee.jpg
http://rvimg.com/images/2003/20030518_keeper_rivets.jpg
http://rvimg.com/images/2003/20030518_heat_box_mounted.jpg
http://rvimg.com/images/2003/20030518_view_inside.jpg
http://rvimg.com/images/2003/20030519_tee_installed.jpg
http://rvimg.com/images/2003/20030519_snap_bushing_and_tubing.jpg
http://rvimg.com/images/2003/20030519_tubing_to_firewall.jpg
http://rvimg.com/images/2003/20030522_fuel_line_installed.jpg
)_( Dan
RV-7 N714D (1238 hours)
www.rvproject.com / www.weathermeister.com / www.weighmyplane.com
---
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dan(at)rvproject.com
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| Posted: Fri Mar 30, 2007 12:12 pm Post subject: Purge valve return line |
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| Quote: | I could just pop an extra fitting in the cover plate of the tank, but
should
it be at the bottom, or near the top? If I end up not using it, I suppose
I
could just cap it off.
|
Not having done this myself, take my advice with a grain of salt...but I
don't personally think it matters much where you put the return fitting.
And FWIW, after 1239 hours on my RV-7, I haven't had any purge related
issues whatsoever. The way I teed it into the supply upstream of the
selector has worked just fine. I do think that if you are BUILDING fuel
tanks it makes sense to at least provision for returned fuel...but if you're
dealing with already completed tanks or retrofitting a purge valve onto a
flying airplane, personally I wouldn't bother with anything other than the
teed-in solution. Just my 2 cents!
)_( Dan
RV-7 N714D
www.rvproject.com
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